Children not seen in two years may have been seen on Downs

TWO children missing for more than two years may have been sighted on the Darling Downs with their mother.

Thomas Michael Speath, now six, and Serena Lucia Speath, now seven, have been missing since December 5, 2014 after they were not returned from a visitation with their mother Jane Iluci Adare, 48, in Brisbane.

Col Chapman from Child Recovery Australia said he had received unconfirmed reports that the trio was sighted at the Pittsworth Show on March 10 and 11 and at Warwick recently. Police are investigating the sightings.

"We have had unconfirmed sightings which give us confidence and we would like members of the public to take notice of their faces," Mr Chapman said.

Ms Adare, now 47, was initially thought to have fled the country to the United Kingdom but it has been confirmed by authorities she had never left Australia.

Serena Speath's father, Harry, has not seen her since December 5, 2014.Janine Hill

"It is a very difficult case," he said.

The children's father Harry Speath, 60, has spent the past two years trying to find his children, which he last saw in a car driven away by their mother.

Mr Speath said while it would be unusual for Ms Adare to be in the area, it was possible. He has never received a confirmed sighting of his children.

"I don't know where she might be with these kids, I have really got no idea. I have no indication," he said.

Mr Speath said he had always been involved in bringing up his children. The hardest thing now being not being able to be involved in their lives, he said.

"I would think that Jane has changed her name, her appearance and the children's names and appearances," he said.

"She may very well be home schooling them which I worry about its adequacy and she probably only goes out with one child at a time and does things like that."

Mr Speath said the effect on his life since the disappearance had been staggering and asked his ex-wife to think about the children.

Serena and Thomas Speath are believed to be in the company of their mother, Jane Illuci Adare. Janine Hill

"I would say to her think about the kids. It is not fair on them," he said.

"It's like having someone who has died but you can't bury them. It feels a bit like that. I know they are out there somewhere, but it feels like there's no hope that you will ever see them again.

"To the children, I love them. I never stopped looking for them. I always wanted to find them and spend time with them and help them with their school work.

"Their daddy loves them and is never going to stop loving them."

Mr Speath said the children did have blonde hair and blue eyes. Serena needs to carry an EpiPen due to a severe allergy to eggs.

The children will be featured by the Australian Federal Police in May for International Missing Children's Day and are listed on Interpol. Progression images of the children are being made.

Mr Speath has also created a Facebook page called Find Serena and Thomas Speath.

Anyone with information on the whereabouts of the children and their mother should contact Mr Chapman on 0447 777 708 or Crime Stoppers on 1800 333 000.